Workable thermo-acoustic wood board

ABSTRACT

Board of natural or composed wood that improves the thermo-acoustic and vibrational properties of the original raw material, and it is used in various ways as constructive part of internal and external finishing (doors, windows, panels, party wall, supports, etc. . . . ). The wood boards are made by two or more incisions along the longitudinal direction, continuous and/or discontinuous, belonging to planes which are parallel and/or inclined to each other. The single incision lies on a plane which is parallel and/or inclined compared to the different surfaces of the bar. In the created cracks, suitable acoustic insulating, soundproof or sound-blocking materials are inserted that improve further the final soundproofing and even the thermal insulation.

TECHNICAL FIELD

The current invention deals with a board of natural or composed wood(chipboard, MDF, plywood, oriented strand board, glued laminated timber,etc. . . . ) which improves the thermo-acoustic and vibrationalproperties of the original raw material, and it is used in various wayas constructive element for the internal and external finishing.

BACKGROUND ART

The wood boards known till now, are used in the various constructiveelements in the original state, and for this they have the disadvantageof having poor insulating properties against acoustic pollution.

Noise pollution is a problem particularly felt by the public opinion,and it is an essential parameter to determine the life's quality of aperson. Noise pollution means: “the introduction of noise in the livingor external environment so as to cause annoyance or disturbance to therest and to the human activities, danger to the human health,deterioration of ecosystems, of material assets, of monuments, of livingor external environment or so as to interfere with the legitimate usesof those environments.”

DISCLOSURE OF THE INVENTION

To improve the acoustic-insulating power of the wood, which quantifiesits ability to reduce the transmission of incident sound on it, youoperate directly on the main component, that is the wood. The sonicwaves are propagated more easily through rigid materials and surfacesrigidly linked.

The invention modifies the property of rigidity of the wood board,through the execution of two (FIG. 1) or more cuts (FIG. 2) along thelongitudinal direction of the bar. The cuts truncate the cohesion ofwood fibres, producing a discontinuity, which reduces the rigidity ofthe component.

In the created cracks, suitable acoustic insulating, soundproof orsound-blocking (FIG. 10 letter A) materials (metals, textiles, plastics,rubber, mineral wool, synthetic fibres, etc. . . . ) are inserted thatimprove further the final acoustic insulation.

Indeed the use of these materials, which have different physicalproperties (density, elasticity, heat capacity, etc. . . . ) compared towood, limits the transmission of additional frequencies of propagatedacoustic waves.

In addition, the filling of cracks regains a small part of thestructural strength, lost because of the mentioned cuts, and improvesthe total thermal resistance.

The heat transfer coefficient is the amount of heat moved in a directionperpendicular to a surface of unit area, because of a temperaturegradient, in unit time and under steady state conditions.

The materials inserted in the cracks have often heat transfercoefficient lower than those of wood, and therefore improve slightly theglobal thermal insulation of the bar.

The tangential components of the incident sonic waves arrive, at acertain point, to coincide with the frequencies of bending resonance ofthe component, so that on the output face of this there are not only thesonic waves, which were able to pass, but also those caused fromresonant vibrations of the element.

Instead, the modified wood board changes the resonant frequency of thestructure and does not amplify the output vibrations.

Reference terminology:

-   -   Length of cut: longitudinal direction of the bar;    -   Width of cut: transverse direction perpendicular to the surface        of the bar;    -   Depth of cut: transverse direction parallel to the surface of        the bar.

The wood boards are made by two (FIG. 1) or more incisions (FIG. 2)along the longitudinal direction, continuous and/or discontinuous,belonging to planes which are parallel to each other (FIGS. 1 and 3)and/or inclined (FIG. 4).

The single incision lies on a plane which is parallel (FIGS. 1 and 2)and/or inclined (FIGS. 3 and 4) compared to the different surfaces ofthe bar.

The cut of a surface is long as the entire wood board (FIG. 5) or it isformed by several cracks (FIG. 6) of different length, width and height,belonging to the same plane (FIG. 6), and/or to several planes parallelto each other (FIG. 7) and/or to several planes inclined to each other(FIG. 8).

The height of the cracks of the wood bar has equal or unequal thicknesscompared with the height of the cuts made on the same side and/or ondifferent sides of the wood bar.

The width of the cracks of the wood bar has equal or unequal depthcompared with the width of the cuts made on the same side and/or ondifferent sides of the wood bar.

The cuts affect the structural strength of the wood board that stillremains suitable as a constructive element for internal and externalfinishing, except to withstand structural loads.

In fact, empirical tests have showed that the wood board keeps a goodresistance to the applied loads, suitable for applications such as theconstruction of party walls and the execution of supports for differentuses.

The area of application of the current invention is the constructionsector, in which the find belongs to the class of basic semi-finished,and it can be used both as a finished element (FIG. 10), and as astructural component for the support of other elements.

The wood board is workable, in order to obtain frames (FIG. 10) andother products, with the usual machines and tools existing in the timberindustry.

The wood bar is used alone (FIG. 5), or it is assembled in a modular way(FIG. 9), matching the various elements to form a continuous wood panel.

The current invention is used in various ways as constructive part ofinternal and external finishing, with the intention of improving thethermo-acoustic and vibrational insulation; for examples the wood boardis used as component for the production of doors, overhead doors,windows, skylights, shutters, panels, party wall, supports, etc. . . . ,which are some of the possible applications, however they do not coverall the possible uses.

BRIEF DESCRIPTION OF DRAWINGS

Explanations of the figures:

FIGS. 1, 2, 3 and 4—sections of the wood board with two or moreincisions;

FIG. 5—wood bar with continuous and parallel cuts;

FIG. 6—wood bar with discontinuous incisions belonging to the sameplane;

FIG. 7—wood board with discontinuous incisions belonging to parallelplanes;

FIG. 8—wood board with discontinuous incisions and belonging to inclinedplanes;

FIG. 9—example of assembled modular element;

FIG. 10—example of a frame.

1. The board of natural or composed wood (chipboard, MDF, plywood,oriented strand board, glued laminated timber, etc. . . . )characterized by two or more incisions along the longitudinal direction,continuous and/or discontinuous, belonging to planes that are paralleland/or inclined to each other, where suitable materials are inserted. 2.The wood board according to claim 1 characterized in that the singleincision lies on a plane that is parallel and/or inclined inrelationship to the different surfaces of the bar.
 3. The wood boardaccording to claim 1 characterized in that the cut of a surface is longas the entire wood board or it is formed by several cracks of differentlength, width and height, belonging to the same plane and/or to severalplanes parallel to each other and/or to several planes inclined to eachother.
 4. The wood board according to claim 1 characterized in that theheight of the cracks of the wood bar has equal or unequal thicknesscompared with the height of the cuts made on the same side and/or ondifferent sides of the wood bar.
 5. The wood board according to claim 1characterized in that the width of the cracks of the wood bar has equalor unequal depth compared with the width of the cuts made on the sameside and/or on different sides of the wood bar.
 6. The wood boardaccording to claim 1 characterized in that the insertion in the fissuresof suitable acoustic insulating, soundproof or sound-blocking materials(metals, textiles, plastics, rubber, mineral wool, synthetic fibres,etc. . . . ) that improves further the final thermo-acoustic insulation.7. The wood board according to claim 1 characterized in that herworkability in order to obtain frames and other products, with the usualmachines and tools existing in the timber industry.
 8. The wood boardaccording to claim 1 characterized in that the possible marketing bothas a simple basic semi-finished product and as a worked finishedelement.
 9. The wood board according to claim 1 characterized in thatthe use both as single component and as a modular component, performedmatching the various elements to form a continuous wood panel.